Skip to main content
Log in

On extremal problems on classes of functions defined by integral moduli of continuity

  • Published:
Ukrainian Mathematical Journal Aims and scope

Abstract

We obtain lower bounds for solutions of some extremal problems on classes of functions W rH ω1 with integral modulus of continuity ω(t). Some of these bounds are regarded as exact.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

References

  1. V. P. Motornyi, “Approximation of periodic functions by trigonometric polynomials in the mean,” Mat. Zametki, 16, No. 1, 15–26 (1974).

    MATH  MathSciNet  Google Scholar 

  2. V. G. Doronin and A. A. Ligun, “On the exact solution of some extremal problems on the classes of functions defined by the integral modulus of continuity,” Dokl. Akad. Nauk SSSR, 251, No. 1, 16–19 (1980).

    MathSciNet  Google Scholar 

  3. V. P. Motornyi, “Diameters of some classes of differentiable periodic functions in the space L,” Mat. Zametki, 11, No. 4, 531–543 (1975).

    MathSciNet  Google Scholar 

  4. V. P. Motornyi, “On the best quadrature formula of the form Σ n k = 1 p k f(x k ) for some classes of periodic differentiable functions,” Izv. Akad. Nauk SSSR, Ser. Mat., 38, No. 3, 583–614 (1974).

    MathSciNet  Google Scholar 

  5. A. A. Ligun, Inequalities for Seminorms and Extremal Problems of Approximation of Functions by Polynomials and Splines [in Russian], Doctoral-Degree Thesis (Physics and Mathematics), Kiev (1985).

    Google Scholar 

  6. K. Borsuk, “Drei Satze uber die n-dimensionale euklidishe Sphare,” Fund. Math., 20, 177–191 (1933).

    Google Scholar 

Download references

Authors

Additional information

Dneprodzerzhinsk Technical University, Dneprodzerzhinsk. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 49, No. 11. pp. 1499–1503, November, 1997.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Ligun, A.A., Chernaya, E.V. On extremal problems on classes of functions defined by integral moduli of continuity. Ukr Math J 49, 1682–1687 (1997). https://doi.org/10.1007/BF02487506

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF02487506

Keywords

Navigation